Class 7 Computer & AI Chapter 1: Number Systems and How Computers Store Data — practice questions with answers
Free practice for Class 7 Computer & AI, Chapter 1: Number Systems and How Computers Store Data. Try the solved questions below, then take a free test with instant marking and explanations.
25 questions9 easy, 10 medium, 6 hardNCERT · CBSE · State boards
Sample questions with solutions
Q1. Why do computers use the binary number system?
- Their circuits have two states, on and off, shown as 1 and 0
- Binary is the oldest system
- Humans cannot read binary
- It uses ten digits
Show answer
Answer: A. Their circuits have two states, on and off, shown as 1 and 0
Why: Every switch in a circuit is either on (1) or off (0). [NAL syllabus, Class 7 Unit 1]
Why: Every switch in a circuit is either on (1) or off (0). [NAL syllabus, Class 7 Unit 1]
Q2. How many digits does the binary system use?
Show answer
Answer: 2 (± 0)
Why: Binary uses only 0 and 1. [NAL syllabus, Class 7 Unit 1]
Why: Binary uses only 0 and 1. [NAL syllabus, Class 7 Unit 1]
Q3. How many digits does the decimal system use?
Show answer
Answer: 10 (± 0)
Why: Decimal uses 0–9. [NAL syllabus, Class 7 Unit 1]
Why: Decimal uses 0–9. [NAL syllabus, Class 7 Unit 1]
Q4. Convert binary 101 to decimal.
Show answer
Answer: 5 (± 0)
Why: 1×4 + 0×2 + 1×1 = 5. [NAL syllabus, Class 7 Unit 1]
Why: 1×4 + 0×2 + 1×1 = 5. [NAL syllabus, Class 7 Unit 1]
Q5. A group of 8 bits is called a ______.
Show answer
Answer: byte
Why: 8 bits = 1 byte. [NAL syllabus, Class 7 Unit 1]
Why: 8 bits = 1 byte. [NAL syllabus, Class 7 Unit 1]
Q6. A digital image is made of tiny coloured squares called ______.
- pixels
- bytes
- cells
- frames
Show answer
Answer: A. pixels
Why: Each pixel’s colour is stored as numbers. [NAL syllabus, Class 7 Unit 1]
Why: Each pixel’s colour is stored as numbers. [NAL syllabus, Class 7 Unit 1]
Practise all 25 questions free
Timed test, marked instantly, with the correct answer and explanation for every question and a chapter-wise report.
Start the free testFrequently asked questions
How many practice questions are there for Class 7 Computer & AI Chapter 1: Number Systems and How Computers Store Data?
25 questions (9 easy, 10 medium, 6 hard). A few are solved on this page; the free test shows the answer and explanation for every question after you submit.
Is this chapter from the NCERT book?
Yes — it follows the NCERT Class 7 Computer & AI syllabus, used by CBSE and many state boards.